1 首先,请看下面的语句:enum enumType {Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday};这句话有两个作用:第一:声明enumType为新的数据类型,称为枚举(enumeration);第二:声明Monday、Tuesday等为符号常量,通常称之为枚举量,其值默认分别为0-6
C enums In C programming, an enumeration type (also called enum) is a data type that consists of integral constants. To define enums, theenumkeyword is used. enum flag {const1, const2, ..., constN}; By default,const1is 0,const2is 1 and so on. You can change default values of...
不同的是 enum 实质上是 int 类型的,而 union 可以用于所有类型,并且其占用空间是随着实际类型大小变化的。57. unsignedunsigned(无符号),表明该类型是无符号数,和 signed 相反。58. using表明使用 namespace。59. virtualvirtual(虚的),C++ 中用来实现多态机制。60. voidvoid(空的),可以作为函数返回...
Friday,Saturday};int main() {enum Weekday today; // 声明一个Weekday类型的变量todaytoday = Wednesday; // 使用枚举常量给today赋值// 根据today的值输出对应的星期几switch (today) {case Sunday:printf("Today is Sunday.");break;case Monday:printf("Today is Monday.");break;case Tuesday:printf("...
定义枚举类型enum YOURENUMTYPE{ID1,//如果不额外指定则第一个标识等于整数0,后续依次加1ID2,ID3=7,...IDn//最后一个标识符后面没有逗号};//注意一定要加上这个分号定义枚举变量enum YOURENUMTYPE varname;给枚举变量赋值 varname = IDx;举个完整的例子enum FRUIT{APPLE,PEAR,ORANGE,PEACH,GRAPE...
The remaining identifiers are given the values 1 through 5 by default. In this example, a value from the set DAY is assigned to the variable today. C Copy enum DAY today = wednesday; The name of the enumeration constant is used to assign the value. Since the DAY enumeration type was...
Type type = typeof(Country); if(Enum.IsDefined(type,0)) { Enum.ToObject(type, 0); } if(Enum.IsDefined(type,"HK")) { Enum.Parse(typeof(Country), "HK"); } 上述代码中只有 0 会成功转换为枚举值 CN ,因为 0 所对应的枚举值是 CN ,而 HK 并没有在枚举中。三、标志...
"switch", "case", "default", "goto", "auto", "static", "register", "extern", "struct", "union", "enum", "typedef", "sizeof"}; // 1.加入其他关键字 int atype, id = 4; const char *space_word_table[11] = {",", ";", "(", ")", "[", "]", "{", "}", "."...
break:跳出当前循环 case:开关语句分支 char:字符型 const:声明只读变量,初始化后不能被更改 continue:结束当前循环,开始下一轮循环 default:开关语句中的“其它”分支 do:循环语句的循环体 double:双精度浮点型 else:条件语句否定分支(与 if 连用) enum:声明枚举类型 extern:声明变量或函数是在其它文件或本文件的...
enum_type enum_val; 1. enum enum_type{/*enum_type*/} enum_val;//声明类型时同时定义 1. 枚举对象的操作 枚举对象仅能取该类型中的值,即值 该类型索引。 枚举变量占用内存与int一致。 枚举变量能且仅能参与赋值、比较、输出操作,参与运算时使用索引值。